Polyfluoroalkoxy substituted aromatic carboxylic acids and esters andsalts thereof

ABSTRACT

ACYL HALIDES, ESTERS, AMIDES, HYDRAXZIDES AND SALTS AS WELL AS THE ACID FROM DERIVED FRO AROMATIC ACIDS SUBSTITUTED BY POLYFLUOROALKOXY GROUPS. THESE COMPOUNDS ARE VALUABLE AS SYNTHETIC INTERMEDIATES IN THE PREPARATION OF PHYSIOLOGICALLY ACTIVE COMPOUNDS.

United States Patent O 3,766,247 POLYFLUOROALKOXY-SUBSTITUTED AROMATIC CARBOXYLIC ACIDS AND ESTERS AND SALTS THEREOF Arthur Mendel, Vadnais Heights, Minn., assignor to Riker Laboratories, Inc., Northridge, Calif. No Drawing. Filed July 22, 1970, Ser. No. 57,350 Int. Cl. C07c 69/76 US. Cl. 260473 R 17 Claims ABSTRACT OF THE DISCLOSURE Acyl halides, esters, amides, hydrazides and salts as well as the acid form derived from aromatic acids substituted by polyfiuoroalkoxy groups. These compounds are valuable as synthetic intermediates in the preparation of physiologically active compounds.

DETAILED DESCRIPTION This invention relates to polyfiuoroalkoxy-substituted aromatic carboxylic acids and amides, esters, acyl halides, hydrazides and salts derived therefrom. These compounds are useful as synthetic intermediates in the preparation of physiologically active compounds, such as local anesthetics and antiarrhythmics.

A preferred class of compounds of the invention are those having the formula:

X-i'i-Ar (O CHgRf) wherein X is amino (--NH 2-haloethylamino hydrazino (NHNH alkoxy containing from one to four carbon atoms (OR wherein A is alkyl or CH R halogen (selected from fluorine, chlorine and bromine), hydroxy or OM (wherein M is a metal ion), Ar is an aromatic carbocyclic system of six to ten carbon atoms, each R; is a fluorocarbon group containing from one to three carbon atoms and n is one to four. The complete fluorocarbon group (R can be a fully or partially fluorinated alkyl group having a straight or branched structure. There can be no more than one hydrogen atom on any carbon atom and two carbon atoms in the R, group can be linked together by an oxygen atom. Thus, in addition to the optional oxygen atom, R, can contain only carbon, fluorine and hydrogen. A preferred class of the compounds of the invention is made up of those compounds in which R, is Q F Y, wherein m is 1-3 and Y is hydrogen or fluorme.

A particularly preferred subclass of the compounds are those in which Ar is a naphthalene nucleus and n is one. These compounds are particularly useful for the preparation of local anesthetics having activity of long duration.

When X is 2-haloethylamino the halogen is chlorine or bromine.

A second preferred subclass consists of compounds in which Ar is a benzene nucleus and n is one or two. These compounds are particularly useful for the preparation of antiarrhythmics of high potency.

Generally, compounds of the invention wherein R is CF are most preferred.

The metal ions (M) in the salts of the invention are preferably alkali metals (such as sodium and potassium), alkaline earths (such as magnesium and calcium), aluminum and the like.

Compounds of the invention wherein X is amino, OR, halogen, hydrazino, hydroxy or OM are readily interconverted to one another by Well-known synthetic procedures.

The compounds of Formula I, wherein X is OR, can be produced by reacting a compound of Formula II with an alkylating ester, for example a fluoroalkyl trifluoromethanesulfonate of Formula III (prepared by methods disclosed in US. Pat. 3,419,595, issued Dec. 31, 1968), as shown in the following equation:

Equation I ROOAHOHM nCFaSOzOCHaR! III III 0 R0 iiAKOCHzROn F n0 FaSOsH wherein R is alkyl and Ar, R; and n are as defined hereinabove.

This reaction is carried out in the presence of sodium carbonate or potassium bicarbonate in an inert solvent such as acetone. Alternatively compounds of Formula II wherein R is hydrogen may be reacted with n+1 moles of compounds of Formula III to give compounds of Formula I wherein X is oCH R The esters of Formula I may be hydrolyzed to the free acid (Formula I, X=OH).

Compounds of Formula I wherein X is halogen are conveniently prepared by refluxing the corresponding esters of Formula I (compounds wherein X is OR) with an excess of thionyl chloride in the presence of a small amount of dimethylformamide. Other conventional methods for the synthesis of acyl halides may also be useful.

Compounds of Formula I wherein X is amino (that is, amides) are conveniently prepared from compounds of Formula I wherein X is halogen by reaction with ammonia, from esters of Formula I by reaction with concentrated ammonium hydroxide and other well-known synthetic methods.

Compounds of Formula I where X is hydrazino are most commonly prepared by treating the ester or acyl halide of Formula I with 40 percent aqueous hydrazine hydrate solution.

Compounds of Formula I wherein X is OH (that is, acids) are prepared by hydrolysis of compounds of Formula I wherein X is a halogen, amino, hydrazino or -OR, or by acidification of compounds of Formula I wherein X is -OM.

Compounds of Formula I wherein X is OM are most conveniently prepared by reaction of acids of Formula I with metal hydroxides or alkoxides, but may also be prepared by hydrolysis of esters, amides, hydrazides and acyl halides of Formula I with metal hydroxides and alkoxides under conditions which modify the rates of these sometimes strongly exothermic hydrolyses.

Compounds of the invention wherein X is 2-haloethylamino are prepared by reaction of compounds of the invention wherein X is chlorine or bromine with ethyleneimine followed by treatment with isopropanolic hydrogen halide to give the desired compound.

The compounds of this invention are converted directly to useful products such as physiologically active compounds, or indirectly by conversion to other compounds of the invention more suitable as direct intermediates to usefuly physiologically active compounds. Thus, acids of Formula I can be reacted with 2-dialkylaminoalkyl halides (or salts thereof) such as 2 (diethylamino)ethyl bromide and its hydrochloride salt in the presence of an acid acceptor, such as potassium bicarbonate or sodium carbonate in an inert solvent such as toluene or benzene to give Z-dialkylaminoalkylene esters of fiuoroalkoxy-substituted aromatic acids. Such compounds are. also prepared by transesten'fication of esters of Formula I with a dialkylaminoalkanol such as 2-diethylaminoethanol.

The 2-dialkylaminoalkylene esters of fluoroalkoxy-substituted aromatic acids are active local anesthetics when tested by Well-known screening methods, and in particular by the corneal reflex test on rabbits described in detail by Lud-uena and Hoppe, J. Pharm. Exptl. Therap., 104:40, 1952. Compounds active as local anesthetics prepared from the compounds of the present invention include:

Z-(dieth'ylamino ethyl 2- (2, 2,2-trifluoroethoxy) -2'- naphthoate 2- (diethylamino) ethyl 2',5-di-(2,2,2-trifluoroethoxy) benzoate 2- (diethylamino) ethyl 1- (2,2,2-trifiu-oroethoxy)-2'- naphthoate and pharmaceutically acceptable salts of these compounds.

The compounds of the invention can also be utilized to prepare physiologically active antiarrhythmic compounds by reaction of compounds of Formula I wherein X is halogen with a 2-(dialkylamino)alkylamine in an inert solvent, such as benzene, toluene or diethyl ether. Alternatively compounds of Formula I wherein X is OR may be reacted with Z-(dialkylamino) alkylamines. Compounds of the invention wherein X is 2-haloethylamino are converted to active antiarrhythmics by reaction with appropriate secondary amines. The N-(2-dialkylaminoalkylene)amide of polyfiuoroalkoxy-substituted aryl acids which are prepared from the compounds of the present invention are active antiarrhythmics according to a well-known screening method described in detail by Lawson in J. Pharm. Expt. Therap., 160222, 1968. The activity is manifested in the ability to block chloroforminduced ventricular fibrillation in mice. Compounds particularly active as antiarrhythmics prepared from the compounds of the present invention include:

N- (2- diethyl aminoethyl) 2- (2,2,2-trifluoroethoxy) benzamide N- Z-diethylamino ethyl) 3- (2,2,2-trifluoroethoxy) benzamide N- (2-diethylaminoethyl -4-(2,2,2trifluoroethoxy) benzamide:

N- (2-diethylaminoethyl) 2,4-di- (2,2,2-trifluoroethoxy) benzamide N- (Z-diethylaminoethyl 2, 5 di- (2,2,2-trifluoro ethoxy benzamide N- (Z-diethylaminoethyl) 2, 6- di- (2,2,2-trifiuoro ethoxy) ibenzarnide N- Z-diethylaminoethyl) 3 ,4di- (2,2,2-trifluoroethoxy) benzamide N- (2- diethylamino ethyl) 1- (2,2,2-trifiuoroethoxy) -2- naphthamide N-( 2-pyrollidinylethyl) 3 (2,2,2-trifluoroethoxy) 2- naphthamide N- (Z-diethylaminoethyl 2,4, 6-tri- (2,2,2-trifluoroethoxy) benzamide and pharmaceutically acceptable salts of these compounds.

The following examples will more fully illustrate the preparation of the compositions of the invention. All temperatures in the examples are given in C.

4. Example 1.Preparation of methyl 2-(2,2,2-trifiuoroethoxy)benzoate A mixture of methyl salicylate (6.4 ml., 7.6 g., 0.05 mole), 2,2,2 trifluoroethyl trifluoromethanesulfonate (13.9 g., 0.06 mole), anhydrous potassium carbonate (1348 g., 0.1 mole) and acetone (150 ml.) is heated under reflux with eflicient stirring for three days. The product is filtered and the filtrate is concentrated to a small volume. It is diluted with cold water and the resulting precipitate is collected and washed successively with cold dilute sodium hydroxide solution and water. The desired material is recrystallized then from aqueous ethanol to afiord whites-olid, M.P. 6l62.

Analysis.Calculated for C H F O (percent): C, 51.3; H, 3.9; F, 24.3. Found (percent): C, 51.2; H, 4.1; F,25.0.

Example 2.--Preparation of methyl 1-(2,2,2-trifluoroethoxy)-2-naphthoate A mixture containing 20.2 g. (0.1 mole) of methyl l-hydroxy-2-naphthoate, 29 g. (0.125 mole) of 2,2,2-trifluoroethyl trifluoromethanesulfonate, 20 g. (0.2 mole) of anhydrous potassium bicarbonate and 200 ml. of dry acetone is refluxed for three days. Actone is removed by distillation (steam bath). The residue is cooled and diluted with water. The resulting white solid is collected by filtration and Washed successively with cold dilute sodium hydroxide solution and water. The solid is further purified by several recrystallizations from aqueous alcohol followed by sublimation (oil bath, 75/0.2 mm. Hg), to give white solid, M.P. 69.5-70.5.

Analysis.Calculated for C H =F O (percent): C, 59.2; H, 3.9; F, 20.0. Found (percent): C, 58.9; H, 4.0; F, 21.1.

Additional compounds of the invention wherein X is OR are prepared according to the procedures described in Examples 1 and 2 and are listed in Table I.

TABLE I Melting Example point number Compound (in C.)

3 Methyl 3-(2,2,2-trifluoroethoxy)benzoate 57. 5-59 4 Methyl 4-(2,2,2-trifiuoroethoxy)-benzoate 59. 5-60. 5 di-(Z 2,2-trifiuoroethoxy) benzoate... 30-31 di-(2,2,2-trifluoroethoxy) benzoate.- 70. 5-71. 5 di-(2,2,2-trifluoroethoxy) benzoate 4244 di-(2,2,2-trifluoroethoxy) benzoate 52-54 di-(2,2,2-tr ifluoroethoxy) benzoate 57-59 (11- (2 2,2-trifiuoroethoxy) benzoate 81. 5-82. 5 5-tn'(2,2,2-trifluoroethoxy) 86-87 benzoate. 12 Methyl 3-(2,2,2-tritluoroethoxy)2-naphthoate.- 77-77. 5

Compounds of the invention Where m and n are greater than one are prepared according to the procedures described in Examples 1 and 2 utilizing intermediates of Formula III other than 2,2,2-trifluoroethyl trifluorofonate are shown in Table II.

TABLE II.STARTING MATERIALS Example number Formula II Formula III Product 13 Methyl Z-hydroxybenzoate 1,1-dihydr0perflu0ro-n-propyl trifluoro- Methyl 2-(1,1dihydroperfiuoro-n-propoxy)- methanesulfonate. benzoate. 14 do 1,1,3-trihydIoperfluoro-n-propy1 trifluoro- Methyl 2-(l,l,3-trlhydtoperfluoro-n-propoxy)- methanesulfonate. benzoate. 15 Ethyl 1-hydroxy-2-naphthoate 1,l-dihydroperfiuoro-n-butyl trifluoro- Ethyl 1-(1,l-dihydroperfluoro-n-butoxy)2- methaneslfltonate. naphthoate. Methyl 2,4,6-tnhydroxybenzoate 1,l-dihydroperfluoro-n-propyl trlfiuoro- Methyl 2,4,6-tri-(1,l-dihydroperfluoro-nmethanesultonate. propoxy) benzoate. 17 n-Propyl 2,5-dihydroxybenzoate 1,l-dihydroperflnoroisobntyryl trifluoron-Propyl 2,5-di-(1,1-dihydroperflnoroisomethanesultonate. butoxy)-benzoate. 18 Methyl 4-hydroxyhenzoate 2,2-difluoro-2-(trifluoromethoxy)ethyltrl- Methyl 4-[2,2-difluoro-2-(trifluoromethoxy)- fiuoromethanesulfonate. ethoxy1benzoate.

An example of preparation of a compound of Formula I wherein X is OCH C F Y is given in Example 19.

Example 19.-Preparation of 2,2',2'-trifluoroethyl 2,5-di-(2,2,2-trifluoroethoxy)benzoate To a stirred refluxing suspension of 2,5-dihydroxybenzoic acid (88.3 g., 0.573 mole), potassium bicarbonate (573 g., 5.73 mole) and acetone (2.41.) is added dropwise 2,2,2-trifluoroethyl trifluoromethanesulfonate (564 g., 2.43 mole) in acetone (230 ml.). The mixture is maintained at reflux temperature for forty-eight hours, then additional 2,2,2-trifluoroethyl trifluoromethanesulfonate (139 g., 0.60 mole) in acetone is added and refluxing is continued for twenty-four hours. The acetone is removed by evaporation in vacuo, then the residue is added to water (2 l.). The aqueous layer is extracted with diethyl ether, and the ether layer is washed with saturated aqueous sodium chloride, then dried over sodium sulfate. The ether is evaporated in vacuo, then the residue is distilled to give 2',2',2'-trifluoroethyl 2,5-di-(2,2,2-trifluoroethoxy) benzoate, B.P. 9196 C./ 0.2 mm.

Example Using the method of Example 19, 2,4,6-trihydroxybenzoic acid is reacted with 2,2,2-trifluoroethyl trifluoromethanesulfonate to give 2',2',2-trifluoroethyl 2,4,6-tri- (2,2,2-trifluoroethoxy)benzoate, M.P. 64.8 to 65.8.

Example 21.--Preparation of 2-(2,2,2-trifluoroethoxy)benzoic acid Methyl 2-(2,2,2-trifluoroethoxy)benzoate (8 g., 34.2 mmoles) potassium hydroxide (3.3 g., 350 mmoles), water (50 ml.) and alcohol ml.) are heated together under reflux for 1.5 hours, and distilled until ca. 25 ml. of distillate is removed. The cooled residue is acidified (pH 3) and the resulting white solid is collected and recrystallized (aqueous alcohol) to give flufiy white solid, M.P. 85-865 C.

Analysis.-Calculated for CgHqFgOg (percent): C, 49.1; H, 3.2; F, 25.9. Found (percent): C, 48.8; H, 3.3; F, 26.2.

Example 22.Preparation of 1-(2,2,2-trifluoroethoxy)-2-naphthoic acid A mixture of 10 g. mmoles) of methyl 1-(2,2,2- trifluoroethoxy)-2-naphthoate, 2.9 g., (42 mmoles) of potassium hydroxide, 50 ml. of ethanol and ml. of water is refluxed for one hour, chilled and acidified. The flufiy precipitate is collected, Water washed, and air-dried. It is purified by recrystallization first from chloroform and then from aqueous alcohol, M.P. 171.5-172 C.

Analysis.Calculated for C H F O (perecent): C, 57.8; H, 3.4; F, 21.1. Found (percent): C, 57.8; H, 3.6; F, 21.7.

Compounds of the invention of Formula I wherein X is OH are obtained from each of the products of Examples 3 through 12 by the methods described in detail in Examples 21 and 22. Such products are listed in Table III.

Compounds of the invention wherein X is OH and m and n are greater than one are prepared according to the procedures described in Examples 21 and 22 and listed in Table IV.

ethoxy]-benzoic acid. benzoic acid.

Example 40.Preparation of N-(2-ch1oroethyl)- 2,4-di-(2,2,2-trifluoroethoxy)benzamide Ethyleneimine (2.9 g., 0.068 mole), triethylamine (6.8 g., 0.068 mole) and diethyl ether (250 ml.) are cooled to 0 C. and stirred while adding 2,5-di-(2,2,2-trifluoroethoxy)'benzoyl chloride (22.8 g., 0.068 mole). The mixture is allowed to warm to room temperature and filtered. The filtrate is treated with 6.6 N isopropanol-hydrochloric acid mixture and filtered and the solvent evaporated in vacuo to give N-(2-chloroethyl)-2,5-di-(2,2,2-trifluoroethoxy)benzamide, M.P. 87-88.5 C.

Analysis-Calculated for C H ClF NO (percent): C, 41.5; H, 3.2; N, 3.6. Found (percent): C, 41.1; H, 3.2; N, 3.7.

Example 4l.-Preparation of l-(2,2,2-trifluoroethoxy)- Z-naphthoyl chloride A mixture of 10 g. (37 mmoles) of 1-(2,2,2-trifiuoroethoxy)-2-naphthoic acid, 21.8 ml. (35.7 g., 300 mmoles) of purified thionyl chloride and 3 drops of dimethylformamide is refluxed for one hour. Excess thionyl chloride is removed in vacuo at water aspirator pressure while heating on a steam bath. Last traces of thionyl chloride are removed by vacuum distillation with added benzene. The product is l-(2,2,2-trifluoroethoxy)-2-naphthoyl chloride according to infrared spectral measurement.

Example 42.--Preparation of 2,5-di-(2,2,2-trifiuoroethoxy)benzoyl chloride To 9.4 g. (30 mmoles) of 2,5-di-(2,2,2-trifluoroethoxy)- benzoic acid are added 2 drops of dimethylfor-mamide and 7.2 ml. (11.9 g., mmoles) of purified thionyl chloride. The product is refluxed for 3 hours and excess thionyl chloride is removed in vacuo (steam bath/water aspirator pressure). Last traces of thionyl chloride are removed by similar vacuum distillation with added benzene. The product is 2,5-di-(2,2,2-trifluoroethoxy)benzoyl chloride according to infrared spectral measurement.

Example 43.--Preparation of 4-(2,2,2-trifluoroethoxy)- benzamide A solution of methyl 4-(2,2,2-trifluoroethoxy)benzoate (3 g., 0.013 mole) in methanol (25 ml.) is cooled using a Dry-Ice acetone bath, and the solution is saturated with anhydrous ammonia, then heated in a pressure reactor at for ten hours. The methanolic solution is filtered and the filtrate is evaporated. The residue is chromatographed on neutral alumina and the early fractions which elute rapidly with ethyl acetate are discarded, methyl ethyl ketone fractions are discharded and methanol fractions finally give a tan solid when evaporated. When recrystallized from ethanol the white solid is found to be 4-(2,2,2-trifluoroethoxy)benzamide, M.P. 177- 178 C.

Analysis.Calculated for C H F NO (percent): C, 49.3; H, 3.7; F, 26.0; N, 6.4. Found (percent): C, 49.5; H, 3.8; F, 26.0; N, 6.4.

To 4-(2,2,2-trifluoroethoxy)benzoic acid (2.2 g., 0.01 mole) is added thionyl chloride (23.8 g., 0.2 mole) and the mixture is heated at reflux temperature for two hours. Excess thionyl chloride is removed by distillation on a steam bath at Water aspirator pressure. Cold concentrated ammonium hydroxide is added in small portions to the cooled 4-(2,2,2-trifluoroethoxy)benzoyl chloride. The

white solid product is collected by filtration and recrystallized from ethanol, M.P. 177-178. Its infrared spectrum is identical to that of the product of Example 43.

Compounds of the invention of Formula I wherein X is NH are obtained by the methods described in detail r in Examples 43 and 44. Such products are listed in Table V.

TABLE V Example Melting point number Product (in C.)

45 3-(2,2,2-trifluoroethoxy) benzamide 1465-1475 46--- 3,4-di-(2,2,2-trifluoroethoxy) benzamide l7/173 47--- 2,5-di-(2,2,2-trifiuoroethoxy) benzamide 131-133 48-.. 3,4,5-tri-(2,2,2-tiifiuoroethoxy)benzamide u- 146-147 49 2-(2,2,2-trifiuoroethoxy) benzamide 143-144 5 50.-. 2,4,6-tri-(2,2,2-trifluoroethoxy)benzamide.. 121-122 51--- 3,5-di-(2,2,2-trifiuoroethoxy) benzamide 127. 5-128 5 52 2,6-di-(2 Z-trifluorocthoxy) bcnzamide 115-116 53- 2,4-di-(2,2,2-trifluoroethoxy) benzamlde 135-136 54. 3-(2,2,2- iifluoroethoxy)2-naphthamid 169-170 55- 1-(2,2,2-trifluoroethoxy)-2-napl1thamide 182-183. 5

Compounds of the invention wherein X is NH;,, and m is greater than one are obtained by the methods described in Examples 43 and 44 and are lised in Table VI.

butoxy) 2-naphthoic acid. butoxy) -2-naphthamido.

Example 61.-Preparation of 2-(2,2,2-trifluoroethoxy)- benzoic acid hydrazide Methyl 2-(2,2,2-trifluoroethoxy)benzoate (1.22 g. 5.2 mmole), ethanol (15 ml.) and 5 ml. of 9 5 percent bydrazine (4.75 g. 158 mmole) are refluxed for two hours, cooled, diluted with water (100 ml.) and cooled. The white solid product, 2-(2,2,2-trifluoroethoxy)benzoic acid hydrazide is recrystallized from ethanol, M.P. 102-104.

Analysis.Calculated for C H F N O (percent): C, 46.2; F, 24.3; N, 12.0. Found (percent): C, 46.3; F, 25.3; N, 12.0.

Example 62.--Preparation of 2,6-di-(2,2,2-trifluoroethoxy)benzoic acid hydrazide Thionyl chloride (11.9 g., 100 mmole), 2,6-di(2,2,2- trifluoroethoxy)benzoic acid (2.0 g., 6.3 mmole) and two drops of dimethyl formamide are heated to reflux temperature and maintained at reflux for four hours. Unreacted thionyl chloride is removed by distillation on a steam bath at water aspirator pressure. The residue is dissolved in dry tetrahydrofuran and added dropwise to a solution of 95 percent hydrazine (3.2 g.,lOO mmole) in ethanol (15 ml.). The mixture is allowed to sit overnight and evaporate to dryness. The residue is diluted with water and a white solid collected and purified by sublimation (138-140/0.2 to 0.5 mm. Hg) followed by recrystallization from benzene to give 2,6-di-(2,2,2-trifiuoroethoxy)- benzoic acid hydrazide, M.P. 153-154 C.

8 Analysis.Calculated for C H F N 0 (percent): C, 39.8; H, 3.0; F, 34.4; N, 8.4. Found (percent): C, 39.8; H, 2.9; F, 34.2; N, 8.3.

Compounds of the invention of Formula I wherein X is hydrazino are obtained by the methods described in detail in Examples 61 and 62 are listed in Table VII.

Compounds of the invention wherein X is hydrazino and m is greater than one are prepared by the methods described in Examples 61 and 62 and are listed in Table VIII.

TABLE VIII Example number Starting material Product 72 2-(1,1-dihydroperfiuoro-n- 2-(1,1-dihydropcrfluoro-npropoxy)bcnzoic acid. propoxy)benzoic acid hydrazide.

73 n-Propyl 2,5-di-(1,1-dihydro- 2,5-di-(1,1-dihydroperflu0roperfluoroisobutoxy)- isobutoxy)benzoic acid benzoic acid. hydrazide.

74 2-(1,1,3-trihydroperfluoro-n- 2-(1,1,3-trihydroperfluoro-npropoxy)benzoic acid. propoxy)benzoic acid hydrazide.

75 4-[2,2-difluoro-2- (trifluoro- 4-[2,2- 'fiuoro-Z-(trifluoromethoxy)ethoxy]-benzoic methoxy) ethoxyl-bcnzoic acid. acid hydrazide.

76 1-(1,l-dihydroperfluoro-n- 1-(1,1-dihydroperflu0r0-nbutoxy)-2-naphthoic acid. butoxy) 2-naphth0ic acid hydrazide.

Example 7-7.Preparation of sodium 1 2-(2,2,2-trifluoroethoxy)benzoate 2-(2,2,2-trifluoroethoxy)benzoic acid is dissolved in ethanol and treated with an equimolar amount of sodium hydroxide dissolved in a minimum amount of ethanol and stirred for one hour. The solvent is removed by evaporation in vacuo to give sodium 2-(2,2,2-trifluoroethoxy) benzoate.

Other salts of the invention are readily prepared in an analogous manner. I

What is claimed is:

1. A compound of the formula:

wherein X is alkoxy containing from one to four carbon atoms or OCHgRg, hydroxy or OM and M is a metal ion selected from alkali metal, alkaline earth and aluminum ions, Aris an aromatic carbocyclic hydrocarbon system of six to ten carbon atoms, each R, is a fluorocarbon group containing from one to three carbon atoms and n is one to three.

2. A compound according to claim 1 wherein R is CF5 3. A compound according to claim 1 wherein Ar is a naphthalene nucleus.

4. A compound according to claim 1 wherein Ar is a benzene nucleus.

5. A compound according to claim 3 wherein n is 1.

6. A compound according to claim 4 wherein n is 1.

7. A compound according to claim 4 wherein n is 2.

8. 2,2,2-trifluoroethyl 2,4,6 tris (2,2,2-trifluoroethoxy)benzoate according to claim 4.

9. Methyl 3-(2,2,2-trifluoroethoxy)-naphthoate according to claim 5.

10. Methyl 1-(2,2,2-trifluoroethoxy)-2-naphthoate according to claim 5.

11. Methyl 2-(2,2,2-trifluoroethoxy)benzoate according to claim 6.

12. Methyl 3-(2,2,2-trifluoroethoxy)benzoate according to claim 6.

13. Methyl 4-(2,2,2-trifluoroethoxy)benzoate according to claim 6.

14. Methyl 2,4-di-(2,2,2-trifluoroethoxy)benzoate according to claim 7.

15. Methyl 2,5-di-(2,2,2-trifluoroethoxy)benzoate according to claim 7.

10 16. Methyl 2,6-di-(2,2,2-trifluoroethoxy)benzoate according to claim 7.

17. Methyl 3,4-di-(2,2,2-trifluoroethoxy)benz/oate according to claim 7.

References Cited FOREIGN PATENTS 412,699 4/1925 Germany 260-521 A 10 LORRAINE A. WEINBERGER, Primary Examiner J. F. TERAPANE, Assistant Examiner (1.8. CI. X.R.

15 260-448 R, 520, 521 A, 544 M, 559 R, 559 S 

